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How round is your circle?

by John Bryant and Chris Sangwin. Princeton University Press, 2008

This website contains information to support the book "How round is your circle? : where engineering and mathematics meet" by John Bryant and Chris Sangwin.

Dudeney's dissection Falling apart. Watt's linkage Approximately straight lines.
Peaucellier's linkage How to draw a straight line. A Pantograph Other linkages.
Chebyshev's paradoxical mechanism Chebyshev's paradoxical mechanism. Reuleaux's rotor How round is your circle?
Solids of constant width Solids of constant width Drilling a square hole Applications of non-roundness.
Stacking dominoes Balancing dominoes. The uni-stable polyhedron Amazing polyhedra.
Rolling discs Rolling discs. Measuring area with a bent coat hanger Measuring area.